As U.S. health-care costs continue to grow, supporters of the Affordable Care Act point to a dramatic drop in uninsured citizens, while critics highlight skyrocketing premiums. But the arguments over cost and access largely ignore the impact on the delivery of health-care services to patients. How are care delivery systems transforming to provide Americans with high-quality care at affordable prices? How will Republican efforts to repeal and replace the ACA influence the delivery system?